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33 lines
899 B
Python
33 lines
899 B
Python
import asyncio
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import time
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class MessageStream:
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"""
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A message stream for consumers to subscribe to,
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and for producers to publish to.
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"""
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def __init__(self):
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self._loop = asyncio.get_running_loop()
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self._waiter = self._loop.create_future()
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def publish(self, message):
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"""
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Publish a message to this MessageStream
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:param message: The message to publish
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"""
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waiter, self._waiter = self._waiter, self._loop.create_future()
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waiter.set_result((message, time.time(), self._waiter))
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async def __aiter__(self):
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"""
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Iterate over the messages in the message stream
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"""
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waiter = self._waiter
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while True:
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# Shield the future from being cancelled by a task waiting on it
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message, ts, waiter = await asyncio.shield(waiter)
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yield message, ts
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